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Impact of backscattered light in a squeezing-enhanced interferometric gravitational-wave detector

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arxiv 1307.8176 v2 pith:VSMVHLS2 submitted 2013-07-31 quant-ph physics.optics

S. S. Y. Chua , S. Dwyer , L. Barsotti , D. Sigg , R. M. S. Schofield , V. V. Frolov , K. Kawabe , M. Evans
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G. D. Meadors M. Factourovich R. Gustafson N. Smith-Lefebvre C. Vorvick M. Landry A. Khalaidovski M. S. Stefszky C. M. Mow-Lowry B. C. Buchler D. A. Shaddock P. K. Lam R. Schnabel N. Mavalvala D. E. McClelland
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classification quant-phphysics.optics
keywords detectorslightinterferometricsqueezedadvancedbackscatteredgravitational-waveimpact
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Squeezed states of light have been recently used to improve the sensitivity of laser interferometric gravitational-wave detectors beyond the quantum limit. To completely establish quantum engineering as a realistic option for the next generation of detectors, it is crucial to study and quantify the noise coupling mechanisms which injection of squeezed states could potentially introduce. We present a direct measurement of the impact of backscattered light from a squeezed-light source deployed on one of the 4 km long detectors of the Laser Interferometric Gravitational Wave Observatory (LIGO). We also show how our measurements inform the design of squeezed light sources compatible with the even more sensitive advanced detectors currently under construction, such as Advanced LIGO.

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  1. New modeling of the stray light noise in the main arms of the Einstein Telescope

    physics.ins-det 2025-06 conditional novelty 5.0 of 10

    Stray light noise in Einstein Telescope arms is predicted to stay below the safety margin in ideal conditions, but beam offsets above 4 to 7 cm, tilts above 8 microradians, or strong point absorbers could breach it.

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